Name: Toilet Flapper for Two-Piece Class 5 Toilets
Brand: kohler
SKU: K-GP1078441
Price: 12.75 USD
Availability: InStock
Rating: 4.4857 (35 reviews)

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This new flapper seems to be perfectly functional. I hope it last 22 years like the original one did.

New parts…older toilet

It is an upgrade flapper. It was easy to order and install in a few seconds.

New flapper

Absolutely five stars for this incredible toilet flapper that was the only one that would work with my toilet. The red color perfectly complements the white finish of the toilet tank.
Rather than calling a plumber, the terrific Kohler instructions allowed me to quickly remove th old flapper and install this gem. Would buy again, but my other Kohler toilets use different flushing mechanisms, so that action makes no sense at all. Kudos to Kohler for having such diversity of flushing mechanisms in their commodes.

Incredible Toilet Flapper!

Product was easy to install and fit perfectly. Leaky fixed.

Leaky toilet fixed

Lisa A.

Replaced the original flapper after 17 years- not happy as the replacement is too heavy and covers hole too soon to allow tank water to empty and flush the bowl.  Same chain slack, same position on push lever- both suggested by Kohler help line.  I tried putting additional buoyant material cut from a pool floatie inside the flapper which helped somewhat.  Still have to hold handle down to complete flush☹️

Still holding the handle.

I actually purchased a Kohler toilet from a local home goods salvage dealer/charity outlet second hand. A $600+ toilet for $35 that needed a total rebuild. Purchased all parts directly from Kohler with customer service assistance. This was one part. Easy, affordable, and economical. Now it's the best toilet in my home.

Rink

Received Kohler flapper part number GP1078441.  This Kohler package indicates the flapper replaces Kohler part number 1016546.  The large secondary hole in this flapper allows the flapper to fall too quickly.  This results in a very weak flush on Kohler Cimarron 4634 toilet.  It appears the solution will be a "universal" replacement with adjustable secondary hole.

Poor performance.  Resulted in weak flush on Kohler Cimarron 4634 toilet.

Very difficult to ID model. Finally did. Part didn’t fit. Threw it away rather than deal with hassle of returning. The only thing worse than wrong part was the difficulty of writing this review. You make it unnecessarily hard, probably to avoid posting it.

Toilet part didn’t fit.

I always install Genuine Kohler Parts, they are simply better than after-market imitations.

Genuine Kohler is Better

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Toilet Flapper for Two-Piece Class 5 Toilets

Engineered for consistent performance, KOHLER® GP1078441 flapper assembly ensures a reliable seal with every flush. This essential component is compatible with Cimarron, Memoirs, Devonshire, and Bancroft two-piece toilets, helping maintain sanitary conditions and efficient water usage. Designed for a secure fit, this flapper assembly supports optimal flushing and helps prevent leaks, keeping your toilet running smoothly.

Shop the Toilet Flapper for Two-Piece Class 5 Toilets. See our entire collection of Service Parts.